SlabMat is the smooth alternative to canvas for rolling out slabs of clay.
It is a proprietary non-woven material used instead of canvas for slab rollers producing a smooth clay surface.
The manufacture recommends using a blunt-edged steel fettling knife for cutting clay directly on the slabmat.
You can use cornstarch as a release agent if you find that your clay slabs stick to the slabmat.
Use separate pieces for different colors of clay to avoid contamination by cross-coloration.